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KENNEDY SPACE CENTER, FLA. -- Space Shuttle Discovery's drag chute unfurls upon landing on Runway 15 at NASA Kennedy Space Center's Shuttle Landing Facility as the sun sets on the shortest day of the year, concluding mission STS-116. In the background are the runway's Air Traffic Control Tower (far right) and the 525-foot-tall Vehicle Assembly Building. Aboard are Commander Mark Polansky, Pilot William Oefelein, and Mission Specialists Robert Curbeam, Joan Higginbotham, Nicholas Patrick and Christer Fuglesang, who represents the European Space Agency, as well as Thomas Reiter, who is returnin…